- precache a few sounds being referenced in common game code.

- define misc/secret for Hexen, too. By now there are some mods defining secrets for the game so this sound should be present there.

wadsrc/static/filter/game-hexen/sndinfo.txt

@@ -169,6 +169,7 @@ $alias menu/clear		PlatformStop
 // Hexen does not have ripslop sound like Heretic
 misc/ripslop			dsempty
 misc/netnotch			blddrp1
+misc/secret			dssecret
 
 $alias				intermission/cooptotal		*death
 $alias				intermission/nextstage		DoorCloseLight

wadsrc/static/mapinfo/common.txt

@@ -4,6 +4,7 @@ Gameinfo
 {
 	CheatKey = "maparrows/key.txt"
 	EasyKey = "maparrows/ravenkey.txt"
+	PrecacheSounds = "misc/secret", "misc/teleport", "misc/fallingsplat", "misc/ripslop"
 }
 
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